<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script type="text/javascript">

    console.log(Math.ceil(1.23)); // 1.23 向上取整，找一个离自己最近的比自己大的整数 2

</script>

</html>
